CVE-2026-54060: CWE-789: Memory Allocation with Excessive Size Value in python-pillow Pillow
Pillow is a Python imaging library. Prior to 12.3.0, PIL/FontFile.py FontFile.compile() assembled per-glyph images into a combined bitmap with Image.new("1", (xsize, ysize)) without calling Image._decompression_bomb_check(), allowing a font to trigger excessive allocation during conversion or saving. This issue is fixed in version 12.3.0.
AI Analysis
Technical Summary
CVE-2026-54060 is a high-severity vulnerability in the python-pillow Pillow library affecting versions before 12.3.0. The vulnerability arises from the FontFile.compile() method in PIL/FontFile.py, which assembles per-glyph images into a combined bitmap using Image.new("1", (xsize, ysize)) without invoking Image._decompression_bomb_check(). This omission allows a crafted font to trigger excessive memory allocation during image conversion or saving, potentially causing denial of service due to resource exhaustion. The issue is resolved in Pillow version 12.3.0.
Potential Impact
The vulnerability can cause a denial of service by exhausting system memory when processing specially crafted fonts, impacting availability. There is no impact on confidentiality or integrity according to the CVSS vector. No known exploits are reported in the wild.
Mitigation Recommendations
Upgrade to Pillow version 12.3.0 or later, where this issue is fixed. Patch status is confirmed by the vendor advisory indicating the fix in version 12.3.0. No other mitigation is specified.
CVE-2026-54060: CWE-789: Memory Allocation with Excessive Size Value in python-pillow Pillow
Description
Pillow is a Python imaging library. Prior to 12.3.0, PIL/FontFile.py FontFile.compile() assembled per-glyph images into a combined bitmap with Image.new("1", (xsize, ysize)) without calling Image._decompression_bomb_check(), allowing a font to trigger excessive allocation during conversion or saving. This issue is fixed in version 12.3.0.
CVSS v3.1
Score 7.5high
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-54060 is a high-severity vulnerability in the python-pillow Pillow library affecting versions before 12.3.0. The vulnerability arises from the FontFile.compile() method in PIL/FontFile.py, which assembles per-glyph images into a combined bitmap using Image.new("1", (xsize, ysize)) without invoking Image._decompression_bomb_check(). This omission allows a crafted font to trigger excessive memory allocation during image conversion or saving, potentially causing denial of service due to resource exhaustion. The issue is resolved in Pillow version 12.3.0.
Potential Impact
The vulnerability can cause a denial of service by exhausting system memory when processing specially crafted fonts, impacting availability. There is no impact on confidentiality or integrity according to the CVSS vector. No known exploits are reported in the wild.
Mitigation Recommendations
Upgrade to Pillow version 12.3.0 or later, where this issue is fixed. Patch status is confirmed by the vendor advisory indicating the fix in version 12.3.0. No other mitigation is specified.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-06-11T18:24:35.096Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a4bfce927e9c7971910b4bb
Added to database: 07/06/2026, 19:07:21 UTC
Last enriched: 07/14/2026, 09:00:26 UTC
Last updated: 08/20/2026, 15:52:45 UTC
Views: 90
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